Question

Identify correct orders with respect to properties:
I. B < Al < Mg < K (metallic character)
II. Si < P < C < N (electronegativity)
III. Si < C < N < F (non-metallic character)
IV. Al < Mg < S < P (ionization enthalpy)

• A. I, II, III only
• B. II, III, IV only
• C. I, III only
• D. I, II, III, IV

Hint:

Across a period: electronegativity and ionization enthalpy increase.

Answer 1

The Correct Option is A

Step 1: Metallic character increases down a group and decreases across a period → I is correct.

Step 2: Electronegativity order given is incorrect because actual trend is C < Si < P < N (so II is incorrect).

Step 3: Non-metallic character increases across period and up group → Si < C < N < F is correct.

Step 4: Ionization enthalpy increases across period, so correct order should be Al < Mg < P < S (given IV reversed), so IV is incorrect.

Step 5: Correct statements: I and III only.